Pump and impeller therefor



Dec. 14, 1948. J. 5. KESSLER PUMP AND IMPELLER THEREFOR Filed Nov. 15, 1946 INVENTOR.

' scribed, wherein the Patented Dec. 14, 1948 UNITED STATE PUIHP AND IMPELLER THEREFOR Joseph S. Kessler, Kcnosha, Wis, assignor to Tri- Kenosha, Wis'., a corpora- Clover Machine 00., tion oi. Wisconsin Application This invention relates to improvements in pumps and impellers therefor.

Heretofore impellers for rotary pumps type with which the present invention is concerned have been principally of the flat bladed type, with the blades projecting radially in opposite directions from a central axis, and with said axis lying in the plane of the blades.

It is a general object of the present invention to provide an impeller which is .more suitable than the above mentioned type of impeller for certain types of uses such as the pumping of viscous liquids, or food products such as tomatoes, diced fruits, diced potatoes, soybean mash, and the like.

A more specific object of the invention is to provide an improved impeller which is formed from a flat plate, the portions of the plate on each side of its transverse center line being twisted symmetrically in opposite directions about said center line and the amount of twist being less than 90.

A further object of the invention is to provide' a pump having an impeller as above deamount of twist on the impeller blades bears a different relationship with the width and breadth of the impeller chamber outlet.

A further object of the invention is to provide a pump construction which permits control of the November 15, 1946, Serial No. 709,905 Claims. (Cl. 103-103) Fig. 4 is a plan view of the metal plate used to form an impeller before it has been twisted; Fig. 5 is a view of the impeller looking in the direction indicated by the line 5-5 in Fig. 2; and Fig. 6 is a view of the impeller looking in the direction indicated by the line'6-6 in Fig. 2.

Referring more particularly to the drawing, the numeral. In designates a pump casing which i in general includes a cup-shaped body portion of the pump curve characteristics by the amount of pitch provided by the twisted portions of the impeller blade to thereby adapt the pump to particular uses in such a way that the maximum efliciency is obtained.

Other objects of the invention are to provide a pump which is relatively simple and inexpensive in construction, which is strong and durable, and which is otherwise well adapted for the purpose described.

With the above and other objects in view, the invention consists of the improvements in pumps and impellers therefor, and all its parts and combinations, as set forth in the claims, and 'all equivalents thereof.

In the accompanying drawings, illustrating one complete embodiment of the prefered form of the invention, in which. the same reference numerals designate the same parts in all of the views:

Fig. 1 is a side elevational view of a pump, parts being broken away;

Fig. 2 is a sectional view taken on the line 2-2 of Fig. 1;

Fig. 3 is a top view of the pump;

' ing 'angle illustrated II and a cover I2. The body portion H has a central boss H projecting therefrom through which a drive shaft I3 is journalled. The inner end of the drive shaft projects rotatably into the impeller chamber l4.

Projecting from the periphery of the pump body portion II is an outlet duct 15. The outlet duct communicates with impeller chamber 14 by means of an opemng I which is the outlet opening for the impeller chamber. When the outlet passageway is circular in cross-section as at H, and when it joins the periphery of the impeller chamber at the in Fig. 2, the opening IE will be elliptical. The exact shape of the opening l8 may be varied considerably, depending upon the angle at which the outlet duct 15 intersects the periphery, and depending upon the cross-sectional shape of the passageway portion I1. In many applications it is advantageous to design the cross-section at H as an ellipse. when this is done the shape and dimensions of the open- IB are varied. It is thus apparent that there may be an infinite variety of cross-sectional shapes at H, each one producing a variation in the width a (Fig. 3) of the pump casing outlet,

and in the breadth between the points b and c.

The impeller, designated generally by the numeral I8 is formed from a flat metal plate having the general shape shown in Fig. 4. In

producing this plate the angles d may be varied according to the amount of twist which there is to be in the finished blade. If there is to be only a small amount of twist, then the angles at will be just large enough so that when the plate portions are twisted about the center line e, the edges 19 v will lie in perpendicular planes, parallel to each other, and taken along the lines 20,. The amount of twist of the blade portions, of course, effects the pitch of the blades.

In designing a particular pump it is an important feature of the present invention to have the angle (Fig. 5) so related to the shape of the outlet opening it of the pump casing that when the impeller is installed in the casing. the width of the impeller between the lines 20-20 is conthe periphery oi the trolled so that it is substantially equal to the rotation for the impeller, said blade portions being Wl f the pump ng O t t (s e Fig- 3 twisted to such an angle less than 90 that the and the projected breadth g of the blades at their width of said impeller measured in a direction outer ends, where viewing the impeller as in Fig. parallel to the axis of rotation is substantially 2, will be substantially equal to that dimension 5 equal to the width of said outlet opening of the of the opening l6 which is at right angles to the casing, and so that the projected breadth of th width 0, said dimension being the distance beblades near their outer ends and taken at right the impeller has a proper pitch for the particular 10 at right angles to said opening width.

product to be pumped, and wherein the outer 3. A pump comprising a casing having a cylinportions of the blade have a proper dimensional drical impeller chamber provided with a periphrelationship with respect to the breadth and eral outlet opening, animpeller rotatable in said width of the pump casing outlet so as to produce chamber and having blade portions reversely highly eflicient results. curved on each side of the axis of rotation of the embodiment of the invention the shaft is slotted to the axis of rotation of the impeller is subas at 2| for receiving the neck portion 22 of the stantially equal to the length of the outlet openimpeller. ing in a circumferential direction.

The cover l2 for the pump casing may be re- 4. A pump comprising a casing having a cylinmovably secured in position by means of bolts 23 drical impeller chamber provided with a pe and wing nuts 24 The bolts are shown as pivoteral outlet opening, an impeller rotatable in said ally connected to the body as at 25 so that they 25 chamber and. having blade portions r v rsely may be swung into and out of slots 26 in laterally curved on each side of the axis of rotation of the projecting lugs 21 of the cover. The cover I2 impeller, said blade portions being curved to has a tubular pump inlet fitting 28 projecting such an angle that the width of said impeller axially therefrom, which may be externally measured in a direction parallel to the axis of threaded as at 29 to facilitate the connection of 30 ta s Substantially q l to the Width of an inlet line therewith. said outlet opening of the casing, and so that the Various changes and modifications may b projected breadth of the blades near their outer made without departing from the spirit of the ends and taken at right angles to said impel er invention, and. all of such changes are contem- Width 15 substantially equal t0 the dimension of plated, as may come within the scope of the the outlet opening which is at right angles to claims. said outlet opening width.

What I claim is: 5. A pump comprising a casing having a 1. A pump comprising a casing havin a' cylincylindrical impeller chamber provided with a drical impeller chamber provided with a periphperipheral outlet opening, an impeller rotatable in eral outlet opening, an impeller rotatable in said 40 Said chamber and formed from a relatively flat of said impeller measured in a direction parallel taken at right an les to the axis of rotation of to the axis of rotation is substantially equal to Said impeller is Substantially equal to the length the width of said outlet opening of the casing, 0f the outlet opening in a circumferential direcand so that the projected breadth of the blades 1710!!- near their outer ends and taken at right angles JQSEPH KESS ER. to said impeller width is substantially equal to REFERENCES CITED that dimenslon outlet opeflmg Whlch 15 at The following references are of record in the right angles to said outlet opemng width. fil f this patent:

A pump comprising a casing having a cylindrical impeller chamber provided with a periph- UNITED STATES PATENTS eral outlet opening, an impeller rotatable in said Number Name Date chamber and formed from a relatively flat plate 304,657 Lynch m 2, 1334 havin a central neck portion and having blade 525564 Muller p 4, 1894 portions with diverging side edges reversely 1,004,039 Kundtz Sept- 1911 twisted about the transverse center line of Said 2,101,123 Wyche 7, 1937 

